fuse for O2 sensor heater?

This is a discussion on fuse for O2 sensor heater? within the Technical / Maintenance forums, part of the General Discussion category; Any one know if and where there is a fuse for the heater in the O2 sensors, in a 1999 ...

Re: fuse for O2 sensor heater?

Originally Posted by figment3

got code for heat in O2,just whanted to test ,cant remember how to test sensors themselfs,any one know this?

you will need a volt/ohm meter. now locate the o2 sensor connector. The black wire on the O2 SENSOR HARNESS SIDE of the connector is the signal wire (this is usually a different wire color on the vehicle wiring harness side) you do not need to check this wire. Disconnect the connector, turn the key on and test the remaining 3 wires on the vehicle harness side, there shoud be 2 grounds and 1 battery voltage.